package com.test.servlet;

import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.URLEncoder;
import java.util.Date;

public class CookieDemo1 extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //服务器告诉你你来的时间，把这个时间封装成一个信件，你下回来，服务器就知道你来了

        //解决中文乱码
        req.setCharacterEncoding("utf-8");
        resp.setCharacterEncoding("utf-8");
        resp.setContentType("text/html;charset=utf-8");

        PrintWriter out = resp.getWriter();

        //Cookie,服务器从客户端获取
        Cookie[] cookies = req.getCookies();  //这里返回数组，说明Cookie可能存在多个

        //判断Cookie是否存在
        if(cookies != null){
            //如果存在怎么办
           // out.write(URLEncoder.encode("你上一次访问的时间是: ","utf-8"));
            out.write("你上一次访问的时间是: ");
            for(int i = 0; i < cookies.length;i++){
                Cookie cookie = cookies[i];
                //获取cookie的名字
                if(cookie.getName().equals("lastLoginTime")){
                    //获取cookie中的值
                    long lastLoginTime = Long.parseLong(cookie.getValue());
                    Date date = new Date(lastLoginTime);
                    out.write(date.toLocaleString());
                }
            }

        }else{
            //out.println(URLEncoder.encode("这是你第一次访问本站first...","utf-8"));
            out.println("这是你第一次访问本站...");
        }
        //服务器给客户端响应一个cookie
        Cookie cookie = new Cookie("lastLoginTime", System.currentTimeMillis() + "");

        //cookie有效期设置为1天
        cookie.setMaxAge(24*60*60);

        resp.addCookie(cookie);

    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req, resp);
    }
}
